em dash; sentence case
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@@ -368,7 +368,7 @@ $$
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So we should consider `f(x_n)` an *approximate zero* when it is on the scale of $f'(\alpha) \cdot \alpha \delta$. That $\alpha$ factor means we consider a *relative* tolerance for `f`.
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> For checking if $f(x_n) \approx 0$ both a relative and absolute error should be used--the relative error involving the size of $x_n$.
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> For checking if $f(x_n) \approx 0$ both a relative and absolute error should be used---the relative error involving the size of $x_n$.
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A good condition to check if `f(x_n)` is small is
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